${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ production in pp and in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

The production cross section of prompt ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ charm baryons was measured with the ALICE detector at the LHC at midrapidity in proton-proton (pp) and proton-lead (p-Pb) collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. The ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ and $\overline{\mathrm{\Lambda }}{}_{\mathrm{c}}^{-}$ baryons were reconstructed in the hadronic decay channels ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}\to \mathrm{p}{\mathrm{K}}^{-}{\pi }^{+}$ and ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}\to \mathrm{p}{\mathrm{K}}_{\mathrm{S}}^0$ and respective charge conjugates. The measured differential cross sections as a function of transverse momentum ($p_{\mathrm{T}}$) and the $p_{\mathrm{T}}$-integrated ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ production cross section in pp and in p-Pb collisions are presented. The ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}$ nuclear modification factor ($R_{\mathrm{pPb}}$), calculated from the cross sections in pp and in p-Pb collisions, is presented and compared with the $R_{\mathrm{pPb}}$ of D mesons. The ${\mathrm{\Lambda }}_{\mathrm{c}}^{+}/{\mathrm{D}}^0$ ratio is also presented and compared with the light-flavour baryon-to-meson ratios p$/\pi$ and $\Lambda /{\mathrm{K}}_{\mathrm{S}}^0$, and measurements from other LHC experiments. The results are compared to predictions from model calculations and Monte Carlo event generators.

38 pages, 13 captioned figures, 3 tables, authors from page 33, published version, figures at http://alice-publications.web.cern.ch/node/6701

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